GitLab

Android browser compositor does not have access directly to the
LayerTreeHost, only the compositor. This CL allows to set the
device scale factor from the compositor interface.

BUG=175589


Review URL: https://chromiumcodereview.appspot.com/12220110

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182171 0039d316-1c4b-4281-b951-d872f2087c98